section {
  width: 400px;
  height: 400px;
  margin: 100px auto;
  border: solid 1px grey;
  display: flex;
  padding-left: 100px;
  flex-wrap: wrap;
  align-content: center;
}
section div {
  width: 100px;
  height: 100px;
  border: solid 1px grey;
}
